Hitachi, Ltd.

East Japan Railway Company

Jun Narushima

Shuji Katoh

Shigenori Inoue

Tetsuya Kato

Yasuhiro Nakatsuka

Masaya Ichinose

Akira Bando

Masahiko Honda

Naomi Sato

Yasuhiro Kiyofuji

Yasuhiro Imazu

Osamu Sakuchi

Toshihiko Usui

Masaki Uchita

Rikiya Inoue

A power conversion device is provided which includes a plurality of series circuits each formed of a voltage source and a controlled current source. At least two of said series circuits formed of the voltage source and the controlled current source are connected in parallel. Further, parallel connection points of the series circuits connected in parallel form output terminals.

Power conversion device with a plurality of series circuits

Feeder sections to be a target of interchange are to be expanded in order to improve the effect of power interchange between feeders. A control device for railway power conditioner is connected to a first feeder connected to a load side of a transformer in a first railway substation including a transformer receiving power from a power grid, and a second feeder connected to a load side of a transformer in a second railway substation including a transformer receiving power from a power grid, and decides an amount of power interchanged between the first and second feeders. The control device decides the amount of power interchanged between the first and second feeders, using the received power in the first railway substation and power on the first feeder, and the received power in the second railway substation and power on the second feeder.

Control device for railway power conditioner and control system for railway power conditioner

A power conversion device connected with a three-phase power system through a transformer, including unit converters cascade-connected so that reactors are unnecessary, and volume and weight are reduced. The secondary winding of the transformer is an open winding having six terminals. A first converter group, includes a circuit which has three converter arms, which are star-connected, connected to three of the terminals of the secondary winding. A second converter group, having three different converter arms which are star-connected, is connected to three other terminals of the secondary winding. A neutral point (the point where the star connection is made) of the first converter group, and a neutral point of the second converter group are made to be the output terminals of the power conversion device.

Power conversion device

Growing community of inventors

Hitachi, Japan

Jun Narushima